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Effect of different torques in cyclic fatigue resistance of K3 rotary instruments
Remote (Português (Brasil))


Dental instruments
Root canal preparation

How to Cite

Kawakami DAS, Candeiro GT de M, Akisue E, Caldeira CL, Gavini G. Effect of different torques in cyclic fatigue resistance of K3 rotary instruments. Braz. J. Oral Sci. [Internet]. 2015 Jul. 1 [cited 2023 Sep. 22];14(2):122-5. Available from:


Aim: To assess the effect of different torque values on cyclic fatigue resistance of K3 rotary nickeltitanium (NiTi) files. Methods: Eighty K3 files, size 25 mm, taper 0.04 were divided in 4 groups according to different torques (0.5, 1, 2 and 6 Ncm) and were submitted to a cyclic fatigue test. This test was performed with a device that allowed the file to rotate inside a stainless steel artificial curved canal, simulating the pecking motion. Files rotated until fracture occurred and time to failure was recorded in seconds with a stopwatch. Data were analyzed by ANOVA and Tukey tests (p<0.05). Results: All groups were compared and only the group of 6 showed statistically significant difference (p=0.0002). Conclusions: For #25.04 K3 files, the evaluated torques up to 2 had no influence on cyclic fatigue resistance. Using 6 torque value resulted in lower resistance to cyclic fatigue.
Remote (Português (Brasil))

The Brazilian Journal of Oral Sciences uses the Creative Commons license (CC), thus preserving the integrity of the articles in an open access environment.


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